16a 



SERPULA. 



LoBATA. Nautilus Farctus. Fichtel. t. 9. f. g. h. i. 



p. 515. Nautilus lobatulus. Lin. Tram. viii. p. 117. 



Is faid to be found fodll about Senam, m Etniria. We 

 have alfo noticed it in that ftate amongft minute JVautili 

 from Sienna. 



Vaft abundance have recently occurred amongfl Serttdaria 



■ brought to U5? by filhermen, taken in the deep by trawling : 



fome fpecimens of Sertularia abieiina are covered with them. 



Notwithftandipg fuch refpe(!^lable authority for placing 

 this among the J^autili, we cannot aflent to that opinion. 

 No JVauti/us is ever feffile, whereas this is never detached 

 but by accident, and then the animal dies. Befides nothing 

 can be more irregular in ftru6lure, and the Linncean cha- 

 radlers of the Serpida admit of being often chambered. 



RATA. Shell fuborbicular, compreded, flat beneath, (lightly con- 

 vex abfive, and of a fub-pellucid white colour, with three 

 irregular volutions, and numerous diftimilar concamerations ; 

 the exterior whirl has about nine gloffy and tumid cells, of 

 unequal fize, but ufuaily a larger and fmaller alternate. Di- 

 ameter half a line. 



This 



